2. 外语
  3. The United States is well known for its network of major highways designed to help a driver get from one place to another in the

The United States is well known for its network of major highways designed to help a driver get from one place to another in the

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问题     The United States is well known for its network of major highways designed to help a driver get from one place to another in the shortest possible time.【C1】______these wide modern roads are generally【C2】______  and well maintained, with【C3】______sharp curves and many straight【C4】______, a direct route is not always the most【C5】______one. Large highways often pass【C6】______scenic areas and interesting small towns. Furthermore, these highways generally【C7】______large urban centers which means that they become crowded with【C8】______traffic during rush hours,【C9】______the "fast, direct" routes becomes a very slow route.
    However, there is【C10】______always another route to take【C11】______you arc not in a hurry. Not far from the【C12】______new "superhighways", there are often older,【C13】______heavily traveled roads which go through the countryside【C14】______of these are good two-lane(双车道) roads while others are uneven roads【C15】______  through the country. These secondary routes may go up steep slopes, along high【C16】______, or down frightening hillsides to towns【C17】______in deep valleys. Through these less direct routes, longer and slower, they generally go to places【C18】______the air is clean and the scenery is beautiful, and the driver may have a  【C19】______to get a fresh, clean【C20】______of the world.
【C9】
选项 A、when
B、for
C、but
D、that
答案A
解析 此处是一个非限制性定语从句，修饰时间，因此应用when引导。
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大学英语四级

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